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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sun May 12, 2013 1:22 pm Post subject: Yo Craig |
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Ever have a bitch of a time calibrating a projector only to discover that the screen had yellowed badly? I just took my commerial grade vinal screen outside in direct sunlight and was shocked to see how bad it had yellowed. The last time I re-calibrated the 4600HD before taking it down it was giving me fits. I now think it was the screens fault.
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Chip
A Barco is only a AmPro with training wheels
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Sun May 12, 2013 1:28 pm Post subject: |
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Are you a smoker, Chip?
SC
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sun May 12, 2013 1:53 pm Post subject: |
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| ecrabb wrote: | Are you a smoker, Chip?
SC |
Nope. Smoke free house. I would guess that the screen is 8 years old.
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Chip
A Barco is only a AmPro with training wheels
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Sun May 12, 2013 2:25 pm Post subject: |
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Wow, I'm surprised the screen would yellow so badly. Seems like it would be either only UV or nicotine that would cause such bad yellowing. Exactly what type/brand screen is this? Did you take a photo of it next to some what paper or anything when it was outside? Very curious.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Sun May 12, 2013 2:36 pm Post subject: |
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The screen knew you were using a CRT so it yellowed like phosphor 
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Sun May 12, 2013 2:56 pm Post subject: Re: Yo Craig |
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| stefuel wrote: | | Ever have a bitch of a time calibrating a projector only to discover that the screen had yellowed badly? I just took my commerial grade vinal screen outside in direct sunlight and was shocked to see how bad it had yellowed. The last time I re-calibrated the 4600HD before taking it down it was giving me fits. I now think it was the screens fault. |
I have not seen that before. However, I wouldn't think that a slightly off white screen would make calibrating grey scale difficult. It could cause problems with primary colors in the gamut, but I wouldn't think white would be very affected.
Interesting,
craigr
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun May 12, 2013 3:35 pm Post subject: |
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Here's a trick: Hang the screen upside down. The yellow will be pulled down by gravity and it will be white again.
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sun May 12, 2013 3:43 pm Post subject: |
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I guess it would depend on the coating they used, but like Crabb said only smoke or UV should turn it yellow.
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sun May 12, 2013 5:30 pm Post subject: |
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It's gone now but it was more then just a tinge yellow. It was pretty awfull looking in real light. It was a DaLite 1.3 cinema vision or something like that. Quite honestly, I liked my Behr flat ultra white screen much better then this one.
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Chip
A Barco is only a AmPro with training wheels
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